Environmentally friendly a multifunctional cellulose-based carbon foam for superior electromagnetic wave absorption performance. (November 2022)

• Record Type: Journal Article
• Authors: Zhao, Xueyi; Zhu, Dongmei; Wu, Junzhi; Zhang, Ruiduan; Lu, Xiaoke; Fan, Bingbing; Li, Yang; Wu, Hongjing
• Is Part Of: Composites communications. Volume 35(2022)
• Publication Date: 2022-11
• Subjects: Cellulose/carbon nanotube -- Porous foam -- Interface polarization -- Microwave absorption -- Multifunctional
• DOI: 10.1016/j.coco.2022.101320
• Languages: English
• ISSNs: 2452-2139

Abstract

Abstract: Ingenious microstructure and suitable multicomponent are still challenging for designing lightweight, low-cost, and resource-renewable microwave absorption materials. Herein, environmentally friendly cellulose-based three-dimensional (3D) porous carbon foams were successfully prepared by freeze-drying and carbonization process. The pyrolysis process under gradient temperature could give rise to tunable electromagnetic (EM) parameters. The minimum reflection loss of carbon nanotubes/cellulose foam under 700°C is −55.4 dB (2.11 mm) at 9.27 GHz benefiting from the construction of double nano-interfaces so-called unique "1D-1D" combination, which can improve interface polarization and impedance matching. Furthermore, such carbon foam exhibits good thermal insulation and hydrophobicity, guaranteeing the stable and durable EM wave absorption application in the field of resist deformation, water or humid environments, and high-temperature attacks. Graphical abstract: The ultralow density and strong absorption of 3D-network carbonized cellulose-based aerogel with superior heat insulation ability and exceptional hydrophobicity were successfully prepared via freeze-drying and annealing process in the first time, which could be useful to applicate in the aerospace, stealth weapons, EM protection, etc. Image 1 Highlights: The innovative double-nano effect of nanocellulose combined with CNT promotes the dielectric loss. The optimal reflection loss of carbon foam reaches -55.4 dB at 2.11 mm . This carbon foam exhibits excellent heat insulation and hydrophobic properties .